Index: modules/univention/admin/mapping.py
===================================================================
--- modules/univention/admin/mapping.py	(Revision 57408)
+++ modules/univention/admin/mapping.py	(Arbeitskopie)
@@ -57,6 +57,14 @@
 	else:
 		return ''
 
+def ListToIntToString(_list):
+	if _list:
+		try:
+			return int(_list[0])
+		except (ValueError, TypeError):
+			return '0'
+	return '0'
+
 def ListToLowerString(list):
 	return StringToLower(ListToString(list))
 
Index: modules/univention/admin/handlers/policies/pwhistory.py
===================================================================
--- modules/univention/admin/handlers/policies/pwhistory.py	(Revision 57408)
+++ modules/univention/admin/handlers/policies/pwhistory.py	(Arbeitskopie)
@@ -174,9 +174,9 @@
 
 mapping=univention.admin.mapping.mapping()
 mapping.register('name', 'cn', None, univention.admin.mapping.ListToString)
-mapping.register('length', 'univentionPWHistoryLen', None, univention.admin.mapping.ListToString)
-mapping.register('expiryInterval', 'univentionPWExpiryInterval', None, univention.admin.mapping.ListToString)
-mapping.register('pwLength', 'univentionPWLength', None, univention.admin.mapping.ListToString)
+mapping.register('length', 'univentionPWHistoryLen', None, univention.admin.mapping.ListToIntToString)
+mapping.register('expiryInterval', 'univentionPWExpiryInterval', None, univention.admin.mapping.ListToIntToString)
+mapping.register('pwLength', 'univentionPWLength', None, univention.admin.mapping.ListToIntToString)
 mapping.register('pwQualityCheck', 'univentionPWQualityCheck', None, univention.admin.mapping.ListToString)
 mapping.register('requiredObjectClasses', 'requiredObjectClasses')
 mapping.register('prohibitedObjectClasses', 'prohibitedObjectClasses')